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#lang debug racket
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(require sugar/unstable/js
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xenomorph
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"tables.rkt"
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"struct.rkt"
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(for-syntax "tables.rkt"))
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(provide (all-defined-out))
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(define-syntax (define-table-getters stx)
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(syntax-case stx ()
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[(_)
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(with-syntax ([(TABLE-TAG ...) (hash-keys table-codecs)])
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(with-syntax ([(GETTER-ID ...) (map (λ (tag) (datum->syntax stx (string->symbol (format "get-~a-table" (syntax->datum tag)))))
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(syntax->list #'(TABLE-TAG ...)))]
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[(HAS-ID? ...) (map (λ (tag) (datum->syntax stx (string->symbol (format "has-~a-table?" (syntax->datum tag)))))
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(syntax->list #'(TABLE-TAG ...)))])
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#'(begin
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(define (GETTER-ID this) (get-table this 'TABLE-TAG)) ...
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(define (HAS-ID? this) (has-table? this 'TABLE-TAG)) ...)))]))
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(define (has-table? this tag)
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#;((or/c bytes? symbol?) . ->m . boolean?)
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(define directory (force (ttf-font-directory this)))
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(hash-has-key? (· directory tables) (match tag
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[(? bytes?) (string->symbol (bytes->string/latin-1 tag))]
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[_ tag])))
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(define (get-table this table-tag)
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(unless (has-table? this table-tag)
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(raise-argument-error 'get-table "table that exists in font" table-tag))
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(hash-ref! (ttf-font-decoded-tables this) table-tag (λ () (decode-table this table-tag))))
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(define-table-getters)
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(define (get-table-stream this tag)
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(define directory (force (ttf-font-directory this)))
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(define table (hash-ref (· directory tables) tag))
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(and table (pos (ttf-font-port this) (· table offset)) (ttf-font-port this)))
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(define (decode-table this table-tag)
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(unless (hash-has-key? table-codecs table-tag)
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(raise-argument-error 'decode-table "decodable table" table-tag))
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(define directory (force (ttf-font-directory this)))
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(define table (hash-ref (· directory tables) table-tag))
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;; todo: possible to avoid copying the bytes here?
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(pos (ttf-font-port this) (· table offset))
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(define table-bytes (open-input-bytes (peek-bytes (· table length) 0 (ttf-font-port this))))
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(define table-decoder (hash-ref table-codecs table-tag))
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(decode table-decoder table-bytes #:parent this))
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